Exine in pollen grains is formed by -

Sporogenous cells

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Tapetal cells

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Middle layers

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Pollen mother cells

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Solution

The correct option is B
Tapetal cells

The unusually large nuclear constitution and nutrient rich cytoplasm of the tapetum enables it to provide nutrients and regulatory molecules to the developing pollen grains. The tapetal cells bursts so that it surrounds the developing microspores which forms the outer wall of the pollen grain called the exine.

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The most resistant organic material present in the exine of pollen grains is:

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